Very specific challenges

Wish challenges were not as specific as they are. For example; Destroy 3 warthog in pvp. Why not just be 3 vehicles in pvp.

Also only haveing 4 weekly challenges count at a time is a yikes. All challenges should count at once. I had 4 challenges to do, one was to kill 3 people in slayer. So I loaded up BTB and got slayer. Finished the challenge and got another one after the match. Which was win a BTB and it took me 3 different games to complete even though I won a BTB already.